GTA IV on Xbox Live Multiplayer? No—GTA Online Started with GTA V

No. Grand Theft Auto IV (2008) does not support Xbox Live multiplayer in the sense of free-roam co-op or competitive modes that persist across sessions.

What GTA IV Actually Offered

• Xbox 360 Version: Included a "Multiplayer" menu with modes like Deathmatch, Team Deathmatch, Race, Cops 'n Crooks, and Free Mode. However, this relied on Games for Windows Live / Xbox Live matchmaking. As of 2024, the servers are still technically up, but the concurrent player count hovers around 50.
• No GTA Online: The persistent, character-progression online world launched with GTA V (2013).
• No Split-Screen: Local co-op was never implemented.

If You Want GTA Multiplayer Today

• GTA V / GTA Online — actively updated, cross-gen (PS4/PS5, Xbox One/Series, PC).
• GTA IV PC + FiveM / RAGE:MP — roleplay and custom servers with thousands of players.

GTA IV's multiplayer is a historical curiosity; GTA Online is the living platform.